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  1. or download this
    print $_ foreach @array;
    print $_ foreach keys %hash
    
  2. or download this
    s/will/may/
    
  3. or download this
    $ perl -e'system(perl => "-le %h = map { \$_=>1 } qw(a b c d); print k
    +eys %h") for 1..10'
    cabd
    ...
    cabd
    cabd
    cabd